Improvement in riveting-machines



PATENT OFFICEu HECTOR, MlocoLL, oF

IMPROVEMENT IN R GLASGOW, SCOTLAND.

IVETING-MACHINES.

Specification forming part of Letters Patent No. 207,049, dated August 13, 137B; application tiled January 25, 1878; patented in England, May 2, 1876.

To all whom it may concern Be it known that I, HECTOR MAoGoLL, of Glasgow, in the county of Lanark, Scotland, have invented certain 'new and useful Improvements in Riveting-Maehines, of which the following is a speeication:

My invention relates to certain improvements in riveting-machines or presses driven by a positive motion, and in which a liquid is interposed between two parts of the rain which operates the die. The said liquid has access to a loaded escape-valve, so that, as long as the strain transmitted to the die does not exceed a degree proportionate to the load on the valve, the liquid confined in the space between the two parts of the ram simply acts as a solid part of the saidra-m, but, on such strain being exceeded, a part ofthe liquid passes through the loaded valve and allows the gearing or mechanism to complete the stroke without further increasing1 the strain. t

The object of `my invention is to so con` struct a machine of this character that the ram carrying the die may have a positive inward motion, and that the operation of the loaded valve may be rendered more efiicient.

This object I attain in the manner which I willl now proceed to describe, reference being had to the accompanyingdrawing, the figure in which represents a vertical section of my improved rivetin g-machine.

In the drawing, a transverse horizontal crank-shaft, l, made to rotate in any conven-` V- -int wa VAimparts a horizontal reciprocating --movement t ram which is in two parts, 3 4, made in this example of malleable iron and turned to fit ard werl through a bore in a massive part, 5, of the mainframe casting.

The bore in the part 5 serves as a guide for the ram 3 4, and is fitted with cup-leathers on each sideof a middle space, a part, 6, of which between the two parts 3 and 4 of the ram is filled with liquid. This liquid is in communi cation, by a passage, 7, with a valve, 8, which is loaded by a spring, 9, (crit mightlebya weighted lever or direct weight,) and which is situated in a eistern, 10, and 'when the ram corresponds to the load on the valve 8, this valve opens and allows some liquid to pass ont into the eistern 10 from the space 6 between the two parts of the ram.

0n the return inward of the ram any liquid which has been forced out passes back to the space 6,' through an inlet-valve, 11, provided for the purpose, and opened by a toe-rod, 2, jointed to a lever, l2, which is on a spindle passing through Jthe side of the cistern, an arm on the outer end of the spindle, and indieated by dotted lines, being acted on by a cam-pieee on the crank-shaft 1. As this valve 11 has a positive motion imparted to it on the return stroke of the ram, the water which may have been forced out is `readil y readmitted without requiring the lifting of the valve to depend on the action of the ram.

part of the space 6, so that any air which may accidentally have entered this space may read ily escape.

The full backward travel of the outer part, 4, of the ram is insured by means of a bolt, 15, screwed into the part 3 acted on by the crank, and projecting into a bore in the outer part, 4.

A nut, 16, is screwed on the bolt, and, when moving back, bears against a ring screwed into the mouth of the bore, so that one part, 3, of the ram pulls back the other part, 4, as soon as the space 6 has refilled to the proper extent with liquid.` l

A feather formed on the nut 16 is fitted to slide in a groove formed in the side ofthe bore, so that theinut can be turned by turn ing the rain part 4, so as to adjust the extent to which the tworam parts 3 4 can be separated, and thereby regulate the length of the stroke. A nut, 17, is fixed on the end of the bolt to prevent the nut 16 from being screwed off.

I claim as my invention-i` Ml. In/,a riveting-machine, the combination vof operating mechanism with a rain made in two parts, between which is interposed a body of liquid having access to a loaded escape` 3 4 is subjected to a strain exceeding what valve, the two parts of the ram being so conA The passage 7 communicates with the upper neoted by a. boit that the part carrying the vIn testimony whereof have signed my die may be moved backward by the other name to this specification in the presence of portion of the ram, all substantially as detwo subscribing witnesses.

scribed.

2. The combination of the two-part ram, the HECTOR MACGOLL. connecting-bolt 15 and adj usting-nut, and the loaded escape-valve with the valve 11, open- Witnesses: Y. ing inward, and the toe-rod 2, adapted to be EDMUND HUNT, operated by some Working part of the. ma- LOCK MOORE.

chine7 as and for the purpose set forth. 

